The term Jacob's staff, also cross-staff, a ballastella, a fore-staff, or a balestilha, is used to refer to several things. This can lead to considerable confusion unless one clarifies the purpose for the object so named. The two most frequent uses are:
- in astronomy and navigation for a simple device to measure angles, later replaced by the more precise sextants;
- in surveying for a vertical rod that penetrates the ground and supports a compass or other instrument.
Read more about Jacob's Staff: Astronomy and Navigation, Surveying
Famous quotes containing the words jacob and/or staff:
“I was not unemployed in my profession by the late John Jacob Astor; a name which, I admit, I love to repeat, for it hath a rounded and orbicular sound to it, and rings like unto bullion.”
—Herman Melville (1819–1891)
“We achieve “active” mastery over illness and death by delegating all responsibility for their management to physicians, and by exiling the sick and the dying to hospitals. But hospitals serve the convenience of staff not patients: we cannot be properly ill in a hospital, nor die in one decently; we can do so only among those who love and value us. The result is the institutionalized dehumanization of the ill, characteristic of our age.”
—Thomas Szasz (b. 1920)